Equity - Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,702,750	$ 3,729,037	$ 1,275,015
Reclassification related to redemption of common units in the operating partnership	(310,855)	(1,446,039)
Ending balance	3,910,964	3,702,750	3,729,037
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	5,878	(64)	(2,661)
Unrealized loss recognized in OCI due to change in fair value	3,029	(2,867)	(7,663)
Loss Reclassified from OCI into Income (as Interest Expense)	4,369	8,809	10,260
Net change in OCI	7,398	5,942	2,597
Reclassification related to redemption of common units in the operating partnership	0
Ending balance	13,276	5,878	(64)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	9,496	(1,081)	(2,443)
Unrealized loss recognized in OCI due to change in fair value	3,011	4,122	(4,976)
Loss Reclassified from OCI into Income (as Interest Expense)	4,342	6,455	6,338
Net change in OCI	7,353	10,577	1,362
Reclassification related to redemption of common units in the operating partnership	(3,622)
Ending balance	13,227	9,496	(1,081)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,618)	1,017	(218)
Unrealized loss recognized in OCI due to change in fair value	18	(6,989)	(2,687)
Loss Reclassified from OCI into Income (as Interest Expense)	27	2,354	3,922
Net change in OCI	45	(4,635)	1,235
Reclassification related to redemption of common units in the operating partnership	3,622
Ending balance	$ 49	$ (3,618)	$ 1,017

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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